+extern void repaint_dive(void);
+extern void do_print(void);
+
+/*
+ * Cairo scaling really is horribly horribly mis-designed.
+ *
+ * Which is sad, because I really like Cairo otherwise. But
+ * the fact that the line width is scaled with the same scale
+ * as the coordinate system is a f*&%ing disaster. So we
+ * can't use it, and instead have this butt-ugly wrapper thing..
+ */
+struct graphics_context {
+ int printer;
+ cairo_t *cr;
+ double maxx, maxy;
+ double leftx, rightx;
+ double topy, bottomy;
+};
+
+extern void plot(struct graphics_context *gc, int w, int h, struct dive *dive);
+extern void set_source_rgb(struct graphics_context *gc, double r, double g, double b);